This is the largest single-institution series of single-fraction stereotactic radiosurgery for spinal metastases. It evaluates the safety and clinical outcomes of CyberKnife radiosurgery in 500 lesions across 393 patients. The central question: can spinal radiosurgery match the efficacy already proven for intracranial metastases?
When a spinal metastasis has already received maximal external beam radiotherapy, the patient has traditionally had few options short of open surgery. This series shows single-fraction radiosurgery is a viable salvage tool, delivering high tumor-margin doses while strictly limiting cord dose.
The mechanism to understand: the spinal cord's low radiation tolerance is what caps conventional dosing. The CyberKnife's steep dose gradient decouples tumor dose from cord dose, allowing a median 19 Gy versus the conventional 8 Gy single fraction.
Know the boundaries. Radiosurgery is not for overt spinal instability or deficits from bony compression of neural structures. Those still require decompression and stabilization. Think of it as complementary to surgery: posterior decompression plus instrumentation followed by radiosurgery to residual anterior tumor can avoid a morbid corpectomy in selected patients.
This is a single-institution cohort without a control arm, so weight it as high-quality descriptive evidence rather than comparative proof.
This is the largest single-institution series of single-fraction stereotactic radiosurgery for spinal metastases. It evaluates the safety and clinical outcomes of CyberKnife radiosurgery in 500 lesions across 393 patients. The central question: can spinal radiosurgery match the efficacy already proven for intracranial metastases?
When a spinal metastasis has already received maximal external beam radiotherapy, the patient has traditionally had few options short of open surgery. This series shows single-fraction radiosurgery is a viable salvage tool, delivering high tumor-margin doses while strictly limiting cord dose.
The mechanism to understand: the spinal cord's low radiation tolerance is what caps conventional dosing. The CyberKnife's steep dose gradient decouples tumor dose from cord dose, allowing a median 19 Gy versus the conventional 8 Gy single fraction.
Know the boundaries. Radiosurgery is not for overt spinal instability or deficits from bony compression of neural structures. Those still require decompression and stabilization. Think of it as complementary to surgery: posterior decompression plus instrumentation followed by radiosurgery to residual anterior tumor can avoid a morbid corpectomy in selected patients.
This is a single-institution cohort without a control arm, so weight it as high-quality descriptive evidence rather than comparative proof.